ANALYSIS OF LAND SURFACE DEFORMATION USING DIFFERENTIAL INTERFEROMETRY SYNTHETIC APERTURE RADAR (DINSAR) FOR LOMBOK EARTHQUAKE 2018

• Main Author: Qira, Pupus
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49042
• Institution: Institut Teknologi Bandung

Lombok island was shaken by a foreshock earthquake on July 29, 2018, with a magnitude of 6.4 then on August 5, 2018, with a magnitude of 7.0 as the main earthquake (mainshock). Only two weeks later, the Lombok island was shaken by foreshock on 19 August 2018 at 11:10 WIB with a magnitude of 6.3 and at 21.56 WIB the second mainshock with a magnitude of 6.9. To provide an overview of the intensity of damage caused by earthquakes and fault patterns that cause earthquakes, this study observes land deformation after an earthquake using the Differential Interferogram SAR (DInSAR) method from Sentinel-1 satellite data. Satellite data used are interferogram data before and after an earthquake. The earthquake aftershock relocation data and source mechanism from USGS are also used to clarify the position of the deformation. The results show the position of land deformation and fracture pattern of satellite data in accordance with the mechanism of the source and aftershock relocation data from USGS, which occurred in the northern region of Lombok. This result is also consistent with data released by BNPB regarding the area with the highest damage intensity is North Lombok. Deformation changes of up to 29 cm indicate the northern region of Lombok has quite high earthquake-prone levels. This is because the fault in northern Lombok has the possibility of being closer to land compared to the 2017 national earthquake map. In the long term, a method to identify the intensity of damage that has been done in this study can help create a database of earthquake impacts in an area and support the process of disaster mitigation due to earthquake.